freebsd stable - Feb 2012 - "who /var/log/utx.log" broken in 9.0-RELEASE?

Hi,

According to the who(1) manpage in 9.0-RELEASE, "who /var/log/utx.log"
should be roughly similar to "who /var/log/wtmp" in 8.whever (and
earlier).

I'm getting this on multiple 9.0-RELEASE systems:

janm@mlb-primary: log $ who /var/log/utx.log
who: /var/log/utx.log: Inappropriate file type or format

Is the manpage wrong?

Thanks,

Jan.